President Trump's extensive new travel ban took effect just after midnight on Monday, barring nationals of 12 countries from entering the U.S. and partially restricting those from another seven.

Trump announced the policy last week after a firebombing attack in Colorado, saying it is necessary for national security. It revives a controversial travel ban that Trump had enacted during his first term and promised to restore while on the campaign trail.

"The recent terror attack in Boulder, Colorado has underscored the extreme dangers posed to our country by the entry of foreign nationals who are not properly vetted, as well as those who come here as temporary visitors and overstay their visas," Trump said in a Wednesday video introducing the ban. "We don't want them."

The ban mostly

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